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https://issues.apache.org/jira/browse/CASSANDRA-15592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17041826#comment-17041826
 ] 

Marcus Olsson commented on CASSANDRA-15592:
-------------------------------------------

The branches are updated. 3.11/4.0 contains an additional smaller patch with 
the difference in the test setup compared to 3.0.

Additionally I ran the test code on 3.0/3.11/4.0 without the patch and they all 
got the IllegalStateException mentioned in the ticket (example output from 3.11 
below):
{noformat}
INFO  [GossipStage:1] 2020-02-21 13:48:47,395 Gossiper.java:1106 - InetAddress 
/127.0.0.2 is now DOWN
DEBUG [main] 2020-02-21 13:48:47,398 Gossiper.java:1746 - adding expire time 
for endpoint : /127.0.0.2 (1582289327272)
DEBUG [main] 2020-02-21 13:48:47,399 Gossiper.java:894 - time is expiring for 
endpoint : /127.0.0.2 (1582289327272)

java.lang.IllegalStateException: Attempting gossip state mutation from illegal 
thread: main

        at 
org.apache.cassandra.gms.Gossiper.checkProperThreadForStateMutation(Gossiper.java:178)
        at 
org.apache.cassandra.gms.Gossiper.evictFromMembership(Gossiper.java:465)
        at org.apache.cassandra.gms.Gossiper.doStatusCheck(Gossiper.java:896)
        at 
org.apache.cassandra.gms.ExpireEndpointTest.testExpireEndpoint(ExpireEndpointTest.java:59)
...
{noformat}

> IllegalStateException in gossip after removing node
> ---------------------------------------------------
>
>                 Key: CASSANDRA-15592
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-15592
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Cluster/Gossip
>            Reporter: Marcus Olsson
>            Assignee: Marcus Olsson
>            Priority: Normal
>
> In one of our test environments we encountered the following exception:
> {noformat}
> 2020-02-02T10:50:13.276+0100 [GossipTasks:1] ERROR 
> o.a.c.u.NoSpamLogger$NoSpamLogStatement:97 log 
> java.lang.IllegalStateException: Attempting gossip state mutation from 
> illegal thread: GossipTasks:1
>  at 
> org.apache.cassandra.gms.Gossiper.checkProperThreadForStateMutation(Gossiper.java:178)
>  at org.apache.cassandra.gms.Gossiper.evictFromMembership(Gossiper.java:465)
>  at org.apache.cassandra.gms.Gossiper.doStatusCheck(Gossiper.java:895)
>  at org.apache.cassandra.gms.Gossiper.access$700(Gossiper.java:78)
>  at org.apache.cassandra.gms.Gossiper$GossipTask.run(Gossiper.java:240)
>  at 
> org.apache.cassandra.concurrent.DebuggableScheduledThreadPoolExecutor$UncomplainingRunnable.run(DebuggableScheduledThreadPoolExecutor.java:118)
>  at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
>  at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
>  at 
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
>  at 
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
>  at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
>  at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
>  at 
> org.apache.cassandra.concurrent.NamedThreadFactory.lambda$threadLocalDeallocator$0(NamedThreadFactory.java:84)
>  at 
> io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
>  at java.lang.Thread.run(Thread.java:748)
> java.lang.IllegalStateException: Attempting gossip state mutation from 
> illegal thread: GossipTasks:1
>  at 
> org.apache.cassandra.gms.Gossiper.checkProperThreadForStateMutation(Gossiper.java:178)
>  [apache-cassandra-3.11.5.jar:3.11.5]
>  at org.apache.cassandra.gms.Gossiper.evictFromMembership(Gossiper.java:465) 
> [apache-cassandra-3.11.5.jar:3.11.5]
>  at org.apache.cassandra.gms.Gossiper.doStatusCheck(Gossiper.java:895) 
> [apache-cassandra-3.11.5.jar:3.11.5]
>  at org.apache.cassandra.gms.Gossiper.access$700(Gossiper.java:78) 
> [apache-cassandra-3.11.5.jar:3.11.5]
>  at org.apache.cassandra.gms.Gossiper$GossipTask.run(Gossiper.java:240) 
> [apache-cassandra-3.11.5.jar:3.11.5]
>  at 
> org.apache.cassandra.concurrent.DebuggableScheduledThreadPoolExecutor$UncomplainingRunnable.run(DebuggableScheduledThreadPoolExecutor.java:118)
>  [apache-cassandra-3.11.5.jar:3.11.5]
>  at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 
> [na:1.8.0_231]
>  at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) 
> [na:1.8.0_231]
>  at 
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
>  [na:1.8.0_231]
>  at 
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
>  [na:1.8.0_231]
>  at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
>  [na:1.8.0_231]
>  at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
>  [na:1.8.0_231]
>  at 
> org.apache.cassandra.concurrent.NamedThreadFactory.lambda$threadLocalDeallocator$0(NamedThreadFactory.java:84)
>  [apache-cassandra-3.11.5.jar:3.11.5]
>  at 
> io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
>  ~[netty-all-4.1.42.Final.jar:4.1.42.Final]
>  at java.lang.Thread.run(Thread.java:748) ~[na:1.8.0_231]
> {noformat}
> Since CASSANDRA-15059 we check that all state changes are performed in the 
> GossipStage but it seems like it was still performed in the "current" thread 
> [here|https://github.com/apache/cassandra/blob/cassandra-3.11/src/java/org/apache/cassandra/gms/Gossiper.java#L895].
>  It should be as simple as adding a
> {code:java}
> runInGossipStageBlocking(() ->)
> {code}
> for it.
> I'll upload patches for 3.0, 3.11 and 4.0.
>   



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